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PHOTOTAXIS IN DICTYOSTELIUM DISCOIDEUM AMOEBAE
Author(s) -
Hong Choo Bong,
Häder Maria A.,
Häder DonatP.,
Poff Kenneth L.
Publication year - 1981
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1981.tb05432.x
Subject(s) - phototaxis , action spectrum , dictyostelium discoideum , biology , biological dispersal , biophysics , population , botany , biochemistry , demography , sociology , gene
— An apparatus has been developed to measure phototactic movement in a population of amoebae of Dictyostelium discoideum. Fluence–response curves in white light show a positive phototaxis to light below 100mW/m 2 . Higher intensities cause a negative phototaxis. An action spectrum, based on the zero‐crossing points in fluence–response curves for monochromatic light, shows a major peak at about 405nm and secondary maxima at about 450, 520, 580 and 640nm. This action spectrum resembles the action spectra for accumulations of amoebae in and dispersal from light traps and that of inhibition of aggregation by light, but is distinctly different from the action spectrum for phototaxis by D. discoideum pseudoplasmodia.